<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
         <!-- 卡片视图区域 -->

        <el-card>

            <!-- 警告区 -->
            <el-alert
                title="注意:只运行为第三级分类设置相关参数!" 
                :closeable="false" type="warning" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row>
                <el-col class="cat_opt">
                    <span>选择商品分类: </span>
                    <el-cascader
                        v-model="selectedKeys"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>

            </el-row>

            <!-- tab页签区域 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">

                    <!-- 动态参数面板 -->
                    <el-tab-pane label="动态参数" name="many">
                        <el-button type="primary" @click="addDialogVisible=true" size="mini" :disabled="isBtnDisabled">添加参数</el-button>
                        
                        <!-- 动态参数表格 -->
                        <el-table :data="manyTableData" border stripe>
                            <el-table-column type="expand">
                                <template v-slot="scope">
                                    
                                    <!-- 渲染tag标签 -->
                                    <el-tag closable v-for="(item, i) in scope.row.attr_vals"
                                    :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>

                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)" 
                                        >
                                    </el-input>
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>

                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template v-slot="scope">
                                    <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" size="mini">编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" size="mini">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>

                     <!-- 静态参数面板 -->
                    <el-tab-pane label="静态属性" name="only">
                        <el-button type="primary" @click="addDialogVisible=true" size="mini" :disabled="isBtnDisabled">添加属性</el-button>
                        <!-- 静态参数表格 -->
                        <el-table :data="onlyTableData" border stripe>
                            <el-table-column type="expand">
                                <template v-slot="scope">
                                    
                                    <!-- 渲染tag标签 -->
                                    <el-tag closable v-for="(item, i) in scope.row.attr_vals"
                                    :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>

                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)" 
                                        >
                                    </el-input>
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                             <el-table-column label="操作">
                                <template v-slot="scope">
                                    <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" size="mini">编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" size="mini">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加:'+titleText"
            :visible.sync="addDialogVisible"
            width="50%" @close="addDialogClosed">
            <!-- 添加参数的表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改:'+titleText"
            :visible.sync="editDialogVisible"
            width="50%" @close="editDialogClosed">
            <!-- 添加参数的表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist:[],
            //级联选中框双向绑定到的数组
            selectedKeys:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger: 'hover'
            },
            //被选中的页签
            activeName: 'many',
            //动态参数的数据
            manyTableData:[],
            // 静态属性的参数
            onlyTableData:[],
            // 添加参数对话框的显示与隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },

            //编辑对话框的配置
            editDialogVisible:false,
            editForm:{
                attr_name:''
            },
            editFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有的商品分类列表
        async getCateList(){
            const {data: res} = await this.$http.get('categories')

            if(res.meta.status !==200) return this.$message.error('获取商品分类失败!')

            this.catelist = res.data
        },

        //级联选择框选中项变化,会触发这个函数
        //发起请求根据分类id,及所处的面板获取当前所选分类的参数
        handleChange(){
            this.getParamsData()
        },

        // tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
        },

        //获取当前所选分类的参数
        async getParamsData(){
            if(this.selectedKeys.length !== 3){
                this.selectedKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }

            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: this.activeName}})

            if(res.meta.status !==200) return this.$message.error('获取参数失败!')

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals? item.attr_vals.split(' ') : []
                item.inputVisible = false
                item.inputValue = ''
            })
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },

        //对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },

        //点击按钮,添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return

                const{data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201) return this.$message.error('添加参数失败!')
                
                this.$message.success('添加分类成功!')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },

        // 点击按钮展示修改对话框
        async showEditDialog(attr_id){
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params: {attr_sel:　this.activeName}})

            if(res.meta.status !==200) return this.$message.error('获取参数信息失败!')

            this.editForm = res.data
            this.editDialogVisible = true
        },

        // 修改参数对话框的关闭事件
        editDialogClosed(){
             this.$refs.editFormRef.resetFields()
        },

        // 点击按钮修改参数
        editParams(){
           this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return

                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {
                    attr_name: this.editForm.attr_name,
                    attr_sel:　this.activeName
                })

                if(res.meta.status !==200) return this.$message.error('修改参数信息失败!')
                
                 this.$message.success('修改参数信息成功')
                this.getParamsData()
                this.editDialogVisible = false
           })
        },
        
        // 删除参数信息
        removeParams(attr_id){
            this.$confirm('此操作将永久删除该参数信息, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).then(async () => {
                const{data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                if(res.meta.status !==200) return this.$message.error('删除失败')
                this.$message({
                type: 'success',
                message: '删除成功!'
                })
                this.getParamsData()
            }).catch(() => {
            this.$message({
                type: 'info',
                message: '已取消删除'
            })         
            })
        },

        //文本框失去焦点,或摁下enter键触发
        async handleInputConfirm(row){
            //为空时文本框关闭
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                this.saveAttrVals(row)
            }
            //添加标签并显示
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
            //添加标签并显示
        },
        //更新保存参数标签
        async saveAttrVals(row){
            //需要发起请求,保存这次操作
            const{data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {attr_name: row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals: row.attr_vals.join(' ')})
            if(res.meta.status !==200) return this.$message.error('修改参数项失败!')

            this.$message.success('修改参数项成功')
        },
        // 点击按钮展示文本输入框
        showInput(row){
        row.inputVisible = true
        //让文本框自动获得焦点
        //$nextTick 方法的作用,就是当页面上元素被重新渲染之后,
        //才会指定回调函数中的代码
        this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus()
        })
        },

        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        //如果按钮需要被禁用,则返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedKeys.length !== 3) return true

            return false
        },
        //当前选中的三级分类的id
        cateId(){
            if(this.selectedKeys.length === 3){
                return this.selectedKeys[2]
            }
            return null
        },
        // 动态计算对话框标题
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态参数'
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 5px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>